Parallax Propellar Auto Pilot with OSD advancing

My Parallax autopilot with OSD (on screen display) is moving right along. It also transmits all sensor data to the ground station via XBee. Right now I have adapted Chris and Jordi's ground station to display most data.
Here is also the spin code....

The real limit for this is the angle of attack at which the airfoil stalls. You can use Javafoil to estimate it using blade theory or can do it in a wind tunnel. Also keep in mind that in general the angle of attack is relative to to the flow of the fluid not relative to the horizon. This is probably more information then you wanted, I would go with +/-30 if you want some reasonable values.